HVAC Control Unit Inputs and Outputs
CONNECTOR A
| Cavity | Wire color | Terminal name | Description | Signal |
|---|---|---|---|---|
| 1 | BRN/WHT | M-HEAT(Rr) | Rear mode control motor on the HEAT side | Drive on HEAT side: battery voltage |
| 2 | BLK | M-VENT(Rr) | Rear mode control motor on the VENT side | Drive on VENT side: battery voltage |
| 3 | LT GRN | Rr DEF Rly | Signal for rear window defogger relay | -- |
| 4 | RED | S-COM | Ground exclusive for sensor | Less than 0.5 V at all times |
| 6 | PNK | MODE1 | Inputs front mode control motor signal 1 | -- |
| 7 | LT BLU | MODE 2 | Inputs front mode control motor signal 2 | -- |
| 8 | BLU/BLK | MODE 3 | Inputs front mode control motor signal 3 | -- |
| 9 | BLU | MODE 4 | Inputs front mode control motor signal 4 | -- |
| 10 | GRN | BUS DATA | Front-Rear communication | -- |
| 11 | BLU | DISP-SI | Output Audio-HVAC display A/C communication data | -- |
| 12 | PUR | DISP-CLK | Output Audio-HVAC display A/C communication clock | -- |
| 13 | RED/GRN | BLW-V (Rr) | Feed back signal of rear power transistor drain voltage | With ignition switch ON (II): battery voltage (depending blower motor speed) |
| 14 | GRY | S5V | Power source for humidity sensor, A/C pressure sensor, and air mix control motor (front and rear) | With ignition switch ON (II): about 5 V |
| 15 | PUR | AMD-P (Rr) | Outputs rear air mix control motor potentiometer signal | Drive on COOL side: about 0.5 V Drive on HOT side: about 4.5 V |
| 16 | YEL | AMD-P (Fr) | Outputs front air mix control motor potentiometer signal | Drive on COOL side: about 1.5 V Drive on HOT side: about 4.5 V |
| 17 | GRY | MODE 3 | Recirculation control motor position feed back 3 signal | -- |
| 18 | BLK | MODE 2 | Recirculation control motor position feed back 2 signal | -- |
| 19 | WHT | MODE 1 | Recirculation control motor position feed back 1 signal | -- |
| 20 | LT GRN | Pd | A/C pressure sensor signal | With A/C switch ON: about 1.4-4.8 V (depending on A/C pressure) |
| 21 | PNK | Tarn | Inputs outside air temperature sensor signal | -- |
| 22 | BRN | Teva | Inputs evaporator temperature sensor signal | -- |
| 23 | WHT | B-CAN H | B-CAN communication line | -- |
| 24 | LT GRN | B-CAN L | B-CAN communication line | -- |
CONNECTOR B
| Cavity | Wire color | Terminal name | Description | Signal |
|---|---|---|---|---|
| 1 | RED/BLK | M-HOT (Fr) | Front air mix control motor on the HOT side | Drive on HOT side: battery voltage |
| 2 | GRN/WHT | M-VENT(Fr) | Front mode control motor on the VENT side | Drive on VENT side: battery voltage |
| 3 | GRN | M-DEF (Fr) | Front mode control motor on the DEF side | Drive on DEF side: battery voltage |
| 4 | BLK | GND | HVAC control unit ground (G403) | Less than 0.5 V at all times |
| 5 | YEL | FRS | The recirculation control motor on the FRESH side | Drive on FRESH side: battery voltage |
| 6 | BLU/ORN | REC | The recirculation control motor on the RECIRCULATE side | Drive on FRESH side: battery voltage |
| 7 | GRY | M-COOL (Rr) | Rear air mix control motor on the COOL side | Drive on COOL side: battery voltage |
| 8 | PNK | M-HOT (Rr) | Rear air mix control motor on the HOT side | Drive on HOT side: battery voltage |
| 9 | ORN | M-COOL (Fr) | Front air mix control motor on the COOL side | Drive on COOL side: battery voltage |
| 10 | LT BLU | ILL+ | Power source for illumination | With lighting switch ON (II): battery voltage |
| 11 | BLU | BLW-G (Rr) | Outputs rear power transistor gate voltage | Fan switch to MAX: about 10 V Fan switch to MIN: about 2 V |
| 12 | YEL | ILL- | Ground for illumination | -- |
| 13 | RED | BLW-G (Fr) | Outputs power transistor gate voltage | Fan switch to MAX: about 10 V Fan switch to MIN: about 2 V |
| 14 | BLU | BLW-V (Fr) | Feed back signal of power transistor drain voltage | With ignition switch ON (II): battery voltage (depending blower motor speed) |
| 15 | YEL | IG2 | IG2 power supply | With ignition switch ON (II): battery voltage |